R.L. Thornton Elementary in Dallas was placed on lock down Tuesday due to police activity near the campus.
The lock down at the elementary school, located at 6011 Old Ox Road, was only precautionary, police said.
Dallas police confirmed that they arrived at a home on the 1400 block of Minuet Lane shortly before noon. Police said a person barricaded inside is believed to be suspected of sexual assault.
Officials have not said when the lock down status changed, but children were seen leaving the school shortly before 3:30 p.m.
Officers were seen leaving the area at about 4 p.m., but further information on the standoff is not yet known.